Results:Of 18 large flat colonic polyps,11 located in rectum,3 in sigmoid colon,1 in descending colon,1 in hepatic flexture of colon,1 in ascending colon and 1 in caecum.

• 结果:18例大肠巨大平坦息肉，直肠11例，乙状结肠3例，降结肠1例，结肠肝曲1例，升结肠1例，盲肠1例。